Iphone Jailbreak issue. All apps deleted?

My brother just got a handmedown Iphone 4S and tried to jailbreak it. The file tranfer shut down halfway through and now he doesn't have ANY apps on his phone, not even Messages, Stocks, App Store, etc. Let alone the ones he's downloaded. Does anyone have any suggestions on how he can restore it?

Set the phone to DFU mode and then reset it completely.

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